Excavating bucket digging teeth



y 1951 G. o. RENNER 5? AL 2,984,028

EXCAVATING BUCKET DI'GGING TEETH Filed July 28, 1958 a a] VENTORS i J; -4

EXCAVATIN G BUCKET DIGGING TEETH George 0. Renner, Milwaukee, and Richard F. Voelz,

Butler, Wis., assignors to Renner Manufacturing Company, Butler, Wis, a corporation of Wisconsin Filed July 28, 1958, Ser. No. 751,301

2 Claims. (Cl.37--142) This invention relates to improvements in excavating bucket digging teeth, and more specifically to a digging tooth having separable component parts.

It is a general object of the present invention to provide a two-part digging tooth having detachable tip and shank members, whereby the entire tooth assembly may be removed from an excavating bucket as a unit for repairs or replacement, or the tip portion detached from the shank and separately removed and replaced. Fre-,

quently, the point or tip portion of a digging tooth becomes worn or broken before the rest of the tooth and, in such circumstances, it is expensive and time consuming to have to replace the entire tooth. With the use of the present invention, however, this objection is eliminated as the tip may be replaced without the necessity of also removing and replacing that part of'the tooth which is still in relatively good condition and suitable for further use.

A more specific object of the invention is to provide a digging tooth construction wherein the tip may be slidably engaged about theforward end of the tooth shank and removably secured thereto'by means of a retainer pin having spaced, slightly resilient prongs adapted to be insertedthrough aligned openings in said tip and shank members, the lower ends of said prongs being formed with shoulders designed to snap in place beneath the tip to'hold said pin against displacement.

A further specific object is to provide a digging tooth wherein the shank portion of the tooth may be inserted into a toothreceiving socket on the excavating bucket and removably securedtherein by means of a tapered pin projected through aligned openings in said shank and socket members.

A further object is to provide a two-part excavating bucket "tooth having integral guide means to insure a tight and accurate interfitting of the separable tooth members and shanks and to insure the proper mounting of the assembled tooth on an excavating bucket.

A further object of the invention is to provide an improved diggingtooth" construction which is strong and rugged and which is well adapted for use in excavating buckets.

With the above and other objects in view, the inventionconsists of the improved excavating bucket tooth, anclall of its parts and combinations, as set forth in the claims, .andall equivalents thereof; 1 e

In the drawing accompanying and forming a part of this specification, wherein is shown one complete embodiment of the preferred form of the invention, and wherein like reference characters indicate the same parts in all of the views:

Fig. l is a fragmentary vertical sectional view of the tooth-receiving socket of an excavating bucket with the improved digging tooth in position therein;

Fig. 2 is a fragmentary top plan view of the digging tooth comprising the present invention;

Fig. 3 is a bottom plan view of the tooth; and

Fig. 4 is a fragmentary side elevational view of an ted States Patent excavating bucket socket with the digging tooth mounted therein.

Referring more particularly to the drawings, the numeral 10 (Fig. 1) indicates a socket member on an excavating bucket, said socket member having a longitudinal opening or cavity 11 to slidably receive the shank 12 of a digging tooth. Generally, of course, a number of such sockets are formed on an excavating bucket and are so positioned that the teeth mounted therein will dig dirt or the like and guide it into the bucket. The sides 14 of said socket member 10 project forwardly beyond the top and bottom and are pointed to provide wing-like side extensions 14 which guide the digging tooth shank 12 into said socket. The top 15 and bottom 16 of said socket member are provided with vertically aligned openings 17 therethrough which are designed to removably receive a wedge-like pin 21, as will be more fully described hereinafter.

The digging tooth assembly comprising the present invention includes an elongated shank 12, the rear portion of which is adapted to be projected into the socket member cavity 11, as hereinbefore mentioned. Said shank is generally rectangular in cross section and its top and bottom surfaces converge sharply in front to form a pointed nose 30 with flat top and bottom surfaces. The rear portion of said shank has slightly converging top and bottom surfaces 31 and 32 'to conform to the slightly tapered contour of the socket member cavity 11, as illustrated in Fig. 1. Pairs of spaced raised guides 28 and 29' are formed along the side edges of both the top and bottom respectively of said shank just rearwardly of the nose 30 with the rear ends of said guides fitting between the socket wings 14-, said raised portions each defining a channel to insure the proper and accurate mounting of a tip 13 on said shank, as will 'be hereinafter described.

A tapered, transverse opening 18' is provided through the rear of the shank 12, said opening being designed to register with the aforementioned socket member openings 17 when said shank has been inserted into the socket member cavity 11. A second transverse, tapered opening 19 is provided through the forward portion of said shank.

As will be seen in Fig. 1, a wedge-like retainer pin 21 may be projected vertically through the aligned socket member and shank openings 17 and 18 to lock the tooth shank in operative position within said socket member 10. Said retainer pin 21 has a vertical leading face and an opposite face which is tapered downwardly to provide a wedging action. As illustrated in Fig.1, the leading face of said pin 21 is adapted to abut straight marginal edges 33 and 34 and the front of the openings 17. The lower end of the pin is forked as at 35. When it is desired to remove the entire tooth assembly, for replacement or the like,-the pin 21; may be driven loose and manually withdrawn, the shank being then pulled forwardly and out of the socket member.

7 A hollow, pointed tip 13 is removably engaged on the nose portion of said shank 12, said tip having'upper and lower rearwardly projecting extensions" 26 and 27 with aligned rectangular openings 20'designed to register with the aforementioned forward shank opening 19 when the tip is in the operative position of Fig. 1. As will be seen in Figs. 2 and 3, the opening 20 in the top extension of said tip member is larger than the aligned opening 20 in the bottom extension to coact with the tapered contour of a retainer pin 22 which may be projected through said tip extensions and shank member. The sides (Figs. 1 and 4) of said tip member project rearwardly beyond the body proper as at 3'5 and are curved to fit against forwardly facing concave shoulders 36 of the shank 3 member sides, which shoulders project laterally beyond the sides of the nose 30.

The retainer pin 22 employed to lock the tip 13 on thetooth shank 12 isillustrated in Figsvl and 4. Said pin 22 has a generally rectangular cross-sectional shape and somewhat resembles a clothes pin, having an enlarged head 23 designed to abut the top surface of the tip member. and a pair of spaced prongs 24 adapted to be projected through the tip extension and shank member openings 19 and 20. Said prongs 24 are slightly resilient and may be forced inwardly toward each other when inserted into said tip and shank members, the resiliency of said prongs urging the shoulders 25 firmly against the lower surfaces of the lower extension to pres surably maintain the same against lateral movement. The lower endshoulders 25 tend to snap into place when the pin has been fully inserted to hold the pin against displacement, i

An important feature of the present invention is the guide means employed to insure the accurate interfitting of the detachable shank and tip members and to position the assembled tooth properly. As will be seen in Figs. 2 and 3, the tip has rearwardly projecting top and bottom extensions 26 and 27 which are of a width less than the width of the tip' and are adapted to fit snugly between the pairs of spaced, elongated guides 28 and 29 to insure the proper mounting of a tip on a shank member and insure that the openings 20 in the tip extensions register with the opening 19 in the shank for the proper reception of the retainer pin 22.

The sides 14 of the socket member are provided with wing-like forward extensions 14', as previously indicated, which are designed to guide and assist the insertion of the shank into the socket member cavity. This feature promotes the quick and easy assembly of the shank and insures the proper mounting of the shank within said cavity.

Various changes and modifications may, of course, be made without departing from the spirit of the invention, and all of such changesare contemplated as may come within the scope of the claims.

What is claimed is:

l. A digger tooth assembly for an excavating bucket comprising: a tooth-receiving socket member adapted to be carried by said bucket and having a longitudinal cavity therein and having top and bottom walls with aligned openings therethrough; a shank having a vertical opening extending transversely therethrough near its rear end and having a second vertical opening extending transversely therethrough near its forward end, the rear portion of said shank being inserted into said tooth-receiving socket with said rear shank opening in registry with said aligned socket member openings; a pair of spaced, winglike side extensions projecting forwardly from the sides of said socket member, said extensions defining guide members to direct said shank into said socket; a hollow tip removably mounted on the forward end of said shank, said tip being pointed and having top and bottom portions with rearwardly-projecting extensions having aligned openings registering with said forward shank opening; said shank having an exposed intermediate portion between the forward end of said socket member and the rear end of said tip with the rear of said intermediate portion positioned between said winglike side extensions of the socket; spaced, elongated outwardly projecting guides extending longitudinally on the top and bottom of the exposed portion of said shank and having rear portions overlapped by said winglike side extensions of the socket and having other portions projecting forwardly therefrom and receiving said rearwardly-projecting tip extensions with the latter also overlapped by the forward portions of said wing-like side extensions of the socket member; a retainer pin projected through said registered socket member and shank openings removably locking said shank in operative position within said socket member; and a second retainer pin projected through said registered tip and shank openings at said intermediate portion of the shank and positioned between said elongated outwardly projecting guides and having its ends protected thereby removably locking said tip on said shank. I

I 2. A digger tooth assembly for an excavating bucket comprising: a tooth-receiving socket member adapted to be carried by said bucket and having a longitudinal cavity therein and having top and bottom walls with aligned openings therethrough; a shank having a vertical opening extending transversely therethrough near its rear end and having a second vertical opening extending transversely therethrough near its forward end, the rear portion of said shank being inserted into said tooth-receiving socket with said rear shank opening in registry with said aligned socket member openings; a hollow tip removably mounted on the forward end of said shank, said tip being pointed and having top and bottom portions with rearwardly projecting extensions having aligned openings registering with said forward shank openings, said shank having an exposed intermediate portion between the forward portion of the socket and the rear portion of the tip of less thickness than either of said portions, spaced elongated guides extending longitudinally on the top and bottom of the exposed portion of said shank receiving said rearwardly projecting tip extensions and projecting outwardly beyond the thickness of the latter and having front and rear ends; a retainer pin projected through said registered socket member and shank openings locking said shank in operative position within said socket member; spaced side wings at the forward end of said socket member receiving and embracing the rear ends of said spaced elongated guides of the shank and also overlapping the rear ends of said rearwardly projecting extensions of the tip; and a sec: ond retainer pin projecting through said registered tip and shank openings at said exposed intermediate portion' of the shank, and positioned between said elongated outwardly projecting guides to thereby have its ends protected by said guides.

References Cited in the file of this patent UNITED STATES PATENTS 923,159 Exton et a1. June 1, 1909 1,433,379 Kiesel Oct. 24, 1922 1,808,311 Madonna June 2, 1931 2,538,083 Caifrey Jan. 16, 1951 2,674,816 Daniels et a1. Apr. 13, 1954 2,702,490 Launder Feb. 22, 1955 

